simple calibration

The three layers are 5mm, 15mm and 20mm. they are measured then a proportion is found. These are then averaged to find the required proportion of the current steps.

example:
a = lowest step
b = mid step
c= total height
d = desired proportion


[(5mm/a)+(15mm/b)+(20mm/c)] /3= d

this will then be multiplied by the original setting (if still stock, in sprinter, equals 2560) in your Arduino interface.